Question

if behaviors increase fitness, they are likely to become more common over time.
yes
no

Explanation:

In evolutionary biology (a subfield of Natural Science), behaviors that enhance an organism's fitness (ability to survive and reproduce) are favored by natural selection. Over time, such behaviors tend to become more prevalent in a population as individuals with these behaviors have better reproductive success, passing on the traits (or behaviors) associated with higher fitness. So the statement is correct.

Answer:

Yes